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    Floating-point environment

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    <metanoindex/>

     
    C++
     
    Numerik-Bibliothek
    Gemeinsame mathematischen Funktionen
    Floating-Point-Umgebung
    Komplexe Zahlen
    Numerische Arrays
    Pseudo-Zufallszahlen
    Compile-time rationale Arithmetik (C++11)
    Generische numerische Operationen
    Original:
    Generic numeric operations
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    iota(C++11)
    accumulate
    inner_product
    adjacent_difference
    partial_sum
     
    Floating-Point-Umgebung
    Funktionen
    Original:
    Functions
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    feclearexcept(C++11)
    fetestexcept(C++11)
    feraiseexcept(C++11)
    fegetexceptflag
    fesetexceptflag    		(C++11)
    (C++11)
    fegetround
    fesetround    		(C++11)
    (C++11)
    fegetenv
    fesetenv    		(C++11)
    feholdexcept(C++11)
    feupdateenv(C++11)
    Makro Konstanten
    Original:
    Macro constants
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    FE_ALL_EXCEPT
    FE_DIVBYZERO
    FE_INEXACT
    FE_INVALID
    FE_OVERFLOW
    FE_UNDERFLOW    		(C++11)
    FE_DOWNWARD
    FE_TONEAREST
    FE_TOWARDZERO
    FE_UPWARD    		(C++11)
    FE_DFL_ENV(C++11)
     
    Die Floating-Point-Umfeld ist die Menge der Floating-Point-Status-Flags und Regelungsarten durch die Umsetzung unterstützt. Es ist Thread-lokalen, erbt jeder Thread den Anfangszustand seinen Gleitkomma-Umgebung, von der übergeordneten Thread. Floating-Point-Operationen ändern die Floating-Point-Status-Flags auf ungewöhnliche Ergebnisse oder zusätzliche Informationen anzeigen. Der Zustand des Floating-Point-Betriebsarten wirkt sich auf die Ergebnisse von einigen Fließkomma-Operationen .
    Original:
    The floating-point environment is the set of floating-point status flags and control modes supported by the implementation. It is thread-local, each thread inherits the initial state of its floating-point environment from the parent thread. Floating-point operations modify the floating-point status flags to indicate abnormal results or auxiliary information. The state of floating-point control modes affects the outcomes of some floating-point operations.
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    Die Floating-Point-Umgebung Zugang und Änderung ist nur dann sinnvoll, wenn #pragma STDC FENV_ACCESS um ON eingestellt ist. Andernfalls wird die Umsetzung ist kostenlos anzunehmen, dass Floating-Point-Betriebsarten immer die standardmässigen und dass Fließkomma-Status-Flags sind nie geprüft oder geändert. In der Praxis unterstützen einige aktuelle Compiler die #pragma explizit, aber die meisten Compiler ermöglichen sinnvollen Zugang zu der Floating-Point-Umgebung sowieso .
    Original:
    The floating-point environment access and modification is only meaningful when #pragma STDC FENV_ACCESS is set to ON. Otherwise the implementation is free to assume that floating-point control modes are always the default ones and that floating-point status flags are never tested or modified. In practice, few current compilers support the #pragma explicitly, but most compilers allow meaningful access to the floating-point environment anyway.
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    Types

    definiert in Header <cfenv>
    fenv_t
    Der Typ, der das gesamte Floating-Point-Umgebung
    Original:
    The type representing the entire floating-point environment
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    fexcept_t
    Der Typ, der alle Floating-Point-Status-Flags kollektiv
    Original:
    The type representing all floating-point status flags collectively
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    Funktionen

    (C++11)
    löscht die angegebene Fließkomma-Status-Flags
    Original:
    clears the specified floating-point status flags
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    (Funktion) [edit]
    (C++11)
    bestimmt, welche der angegebenen Gleitkommazahl Status-Flags gesetzt sind
    Original:
    determines which of the specified floating-point status flags are set
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    (Funktion) [edit]
    (C++11)
    wirft die angegebenen Gleitkomma-Ausnahmen
    Original:
    raises the specified floating-point exceptions
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    (Funktion) [edit]
    (C++11)
    (C++11)
    kopiert den Zustand der angegebenen Gleitkomma-Statusflags von oder zu der Fließkomma-Umgebung
    Original:
    copies the state of the specified floating-point status flags from or to the floating-point environment
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    (Funktion) [edit]
    (C++11)
    (C++11)
    ab oder legt Rundung Richtung
    Original:
    gets or sets rounding direction
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    (Funktion) [edit]
    (C++11)
    speichert oder stellt die aktuelle Floating-Point-Umgebung